Grinding-machine.



W. A. MIDT.

EINDI A HI E. AP non FILED Ys, 1912.

1,061,692. Pandmayw, 1913.

2 SHEETS-SHEET 1.

@6.7L 5. .A FIG.

WITNESEES, INVENTEIFQ:

4 d l-hs ATTUNEY WLA. SCHMIDT.

GRINDING MAGHINB.

APPLIOATION FILED JULY 6, 1912. 't

Patented May 13, 1913.

2 SHEETS-SHEET 2.

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IIII l ...""lllllunlulllhl l' D; L WITNEEl-: Inn/Dunn@= www MM HIEATTDRNEY WILHELM A. SCHMIDT. -OF ILION, NEW YORK. ASSIGNOR, BY MESNE ASSIGNMENTS, -TO REMINGTON IYPEWRITER COINIPANY, OF ILION, NEW YORK, A CORPORATION OF NEW YORK.

cRINDING-MACHINE.

l ,()61 .(592, vSpecification of Let-ters Patent. ln'foni'c-d )ray 13 i913,

Application tiled July 6.1912. Serial No. 708.001.

'/l, al! nin/n il may concerti.'

lle it known that l. 'lmmmr.MSmnl nvr, citizen of the United States. and resident of ilion. in the county of llerkinler and State olution. Such surfaces may becylindrical or conicalor ofother configuration. In

some instances the elements of the surface. 20`

are straight lines as in cones or cylinders,

and in others they may be curved lines.

One specific use to which I contemplate applying my invention is to the grinding of the tapered pivots for -the type bars of typewriting machines, and another purpose is to thegrinding of the cylindrical rollers` used in the bearings ofthe carriages of typewriters. -The invention is adapted, howeve'r, for other than these specific uses.

To the above ends my invention consists in certain features of construction and combinations and arrangements of parts, all of which will be fully set forth herein and particularly pointed out in the claims.

In the accompanying drawings, Figures 1, 2 and 3 are cross sections taken axially of three sets of grinding devices having grinding surfaces of dilerent forms. Figs. 4, 5 and 6 are face views of separating, guiding or locating devices `used in connection with the `respective grinding devices shown in Figs. 1, 2 and 3. Figs. 7, 8 and 9 are views like Fig. 1 but showing the devices arranged for grinding still .other forms of surfaces. Fig. 10 is a fragmentary view showing a grinding device arranged for still another form of surface. Figs. 11 and 12 are face views of two grinding plates or laps, the grinding surfaces of which have been interrupted, the first with staggered holes and the latter with a spiral roove. Fig. 13 is a. longitudinal section 'li e Fig. 8 but with laps or plates of the form shown in Fig. 11,

' ticles.

la ps of the character shown in Fig. 12.

The grinding or lapping devices consist essentially of two hodie.-:. laps or plates -ar ranged with e'oimrident. axes andinsome instances a disk or separator is provided with suitable openings to hold a quantity ofthe articles to he ground. the device as a wholef heing like a roller bearing hut of a design which. irra roller hearing. would bef deg4 feeti'e. asy will he explained indeta'il.' One.- of the plates ma v be. stationary and the other and Fig. 14 is a similar view hut. showing- 'UNITED STATES-. EATENT OFFIGE.-

may he rotated. or both plates mayl be Aro tated in opposite directions if prefered.'fj=1 i' :Si

vTn the. drawings there Aare shown"two"cy' lindrical grinding plates. 'a lower plate 1 and an upper plate 2. said plates being of' cast iron or other suitable material. A spin dle 3 passes vertically through central' boresin the two plates, 'thus maintaining said plates with their axes coincident."'Relative' rotation may be imparted "tothe plates: in

any suitable manner. In one arrangement' in which I have used these devices, the bttom plate 1 rests ,on'ithe bed of a. drill press or a machine similar to a drill press-said bottom plate being stationary. Thesplndle 3 has a.' running t in said plate 1 and isrigidly connected with the upper. plate 2. Said spindle is formed with a head having'a centra'l bore 4 in -the tcp thereof and notches 5 cut across the opposite walls of said opening.'

A spindle 6, which may be a part of adrill press or a specially made spindle secured in the drill press after the fashion of a drill, or which` for that matter, may be of any'i suitable character, i's inserted in theopening land said spindle is provided with'a oross pin 'I that works in the notches 5. The spindie 6 is driven or rotated in any suitable manner and is arranged so that it can be moved up and do after the fashion of the spindle of a drill press. I have used this device with a weight controlling the spindle 6 and pressing it downward 'with a suitable' force ada plate 2, which surfaces have.

pted for the grinding of the arbars, such as are used in-the Remington turned to approximately" their final shape,

. 'ends and that thev bear against the plates 1 tended to grind butall .of the plates 1 preferably have one feature' in common, namely, 'a flange 8 turned up on the plate 1 and surrounding the spindle 3. The grinding is preferably doiie with oil and diamond'dust, or some other powdered abrasive, and this flange 8 serves as a dam to 'keep the said abrasive out of the bearing of the spindle `3. In Fig( 1, which shows` the device arranged for grinding pivot pins 9 yfor type,

typewriter, the'two plates have each turned therein an annular groove 10 of a'width equal to-the length of the cylindrical middle part 11 of the lpivot to be ground. These grooves are cut so as not to touch the elongated pins attheir middles where no grinding act-ion is desired. On each side of this groove 10, surfaces 12 are turned, said surfaces 12 being on a taper asshown and having in cross section the double curvature shown in Fig. 1. It is contemplated that quite a number of these pivot pins 9 be placed between lthe grinding plates at one time. Said pins areseparated, located and guided by a. disk 13, Fig. ,4, having a central opening 14 forthe dam 8 and having a number of radial vopenings 15 of approximately the sizel and shape of the longitudinal sections of the pins ".9 to be ground. lIn operation the spindle is raised and the plate 2 is lifted Aotlt' of the plate 1. The pins 9, already areinserted in the disk 413,y one pin being placed in each of the openings 15 and resting on the lower plate@ The plates 1 and 2 are charged with diamond dust or other abrasive and a proper lubricant or cutting i'luid. The. plate 2 is then put in position and the spindle 6 is weighted and allowed to rest in the opening 4, and the spindle is rotated until the. grinding is completed. It will be noted that these pins 9 are tapered at both and 2 at both their tapered end portions. One end of the pin isfarther than the other from the axis of rotation of the plate 2. Said plate will move at the outer end of said pin lat a higher velocity than lit will at the inner end of said pin. The motion of the plate 2 will cause the pins 9 to roll around over the plate 1 somewhat after the fashion of a roller thrust bearing. This bearing is, however. defective in design for a roller bearing in the particular above mentioned, namely, that the plate 2 moves fasterat the outer end of the. pin 9 than it does at the inner end. The result of this .so-called defeet in design is th`at although the pin rolls on the plate 1 it cannot have a true rolling i motion. lts motion is of necessitia combi i nation of a ,rolling and a rubbing action. i B v this con'ibination of motions tlnrbearing ends of tbe'pins are ground accuratelv and i smoothl)y to the form predetermined b v the, i

surfaces that have beenturned or formed in the plates 1 and 2.

In the particular form of surface shownl in the pins 9 in Figs.v 1 and 4 the rolling action is made imperfect-and is therefore combined with a rubbing action for another reason than that mentioned above. The sur face to be ground on these pins is a tapered surface and the rolling motion of the `pinv itself against the plates 1 and 2, even at one end of the pin, could not possibly bea true rolling motion because the taper has a larger diameter at one part than it has at the other. This additional'cause of rubbing action is present in the forms of the invention shown in Figs. 1, 2, 9 and 10. butis not present in those forms shown in Figs. 3, 7 and 8, which figuresv show. the devices arranged forV grinding cylindrical surfaces.

In F ig. 2 the parts are substantially like those of. Fig. 1 exceptthat in this latter ligure true cones are being ground and hground down to a point, thus leaving no room for a separator of the lform shown Ain Figs. 1 and et. In this case a separator 1G is provided consisting of an annulus here' shown as being made of sheet metal bent into a U-shaped cross section and formed with a series of holes 17, Fig. for'the insertion of the pins 18. In Fig. 2 it will be seen that the surfaces 20 in the plate 2 extend down past the axes of the pins 1S. The device'is thus adapted for grinding the cones to a sharp point. i

In Figs. 3 and 6 I have shown a form of the'invention adapted for grinding short cylindrical rollers 'such as are used for the bearings of the carriages of typewriting machines. In this case the plate 1 is turned to form a shoulder 21 to supporta separator plate 22 having openings 23 therein for guiding a large number of short rollers 24,. As shown in Fig. 6 these openings 23 can be staggered so as to get in quite a large number of rollers and to ut-ili'le as much as possible of the grinding surfaces lof the plates 1 and 2, which grinding surfaces in lthis instance are Hat.

In Fig. 7 I have shown'- another form of device for grinding short cylinders without the use of any separator disk. 'ln this instance the plate 1 has near its periphery an inclined surface 25 and this is bounded by a guiding surface 26. The plate 2 is formed with a surface 27 at the same inclination as the surface 25 and with an outer guiding surface 2S. the distance between the surfaces 26 and 2S being appropriate to guide the particular tsort of roller 3l) that lis intended to be ground in this device. Aln this case a large number'of these rollers can be set around the plate 1 and then when the plate. is putin position said rollers will all be held in place and properly guided by the surfaces 26 and 2S and thcc vlindrical faces A vices arranged for grinding cones.

of said rollers will be ground b v thesurfaces 25 and 27; In practice, where an accurate cylindrical surface is desired, l prefer to use a separator disk as shown, for example. in Fig. 3.

In Fig. S I have shown the device arranged for grinding lougcylindrical rollers 31. In this case the grinding surfaces are flat surfaces but I have shown the. plate 1 formed with a guiding'ilange 32 for the ends of the, rollers. long, however, to be kept in radial position solely by end flanges as inthe case of Fig. 7 and a separating disk 33 is therefore provided similar to the disk 13 in -l `ig. 14 but with the openings 15 of a. shape adapted for the rollers 31'.

'In Figs. 9 and 10 I have shown the de- In this ease the grinding surface of one`of the plates can be flat and that of the other plate can be conical as shown. In order to secure the so'called defective design in this instance when considered as a roller bearing, the device should be so arranged that the apex of the cone to be ground is not in the axis 34 of the spindle If the. cone is of a slight taper like the cone 35 in Fig. t) the parts may be so designed that the apex 36 of said cone will come bevond the axis` 34. If the cone has a greater taper like the cone 37 shown in Fig. 10 then the parts may be so designed that. the apex 38 of said cone comes short of the axis 34. In either event the plate 1 is preferably formed with a guiding flange 40 to limit the niotion of the cone away from the axis 3l and a disk 41 is provided similar to thedisk 13 but with holes therein suitable for the devices to be ground. In the extreme case illustrated in Fig. 10 the disk 41 is shown cupped in order better toaccommodate it to the shape of the cone 37.

In each of the forms of the device illustrated, it will be noted that the plates or members 1 and 2 havelturned or formed therein annular surfaces, the cross sections of which are complementar),1 in forni to the longitudinal sections of the articles to be ground and it will be noted that. except in the ease ofthe cylindrical rolls.- the iadii of each of said surfaces vary at different points along the axis of the article. It will also be noted in each instance that means are provided. such. for example, as the separator plate 13 of Fig. 1 and the flanges 26 and 52S of Fig. 7. for so guiding the articles to be ground that the axes of said articles when A prolonged pass through the common axis of the plates 1 and 2. lt is not. however. essential in all instances that the longitudinal axis` of the article to be ground shall pass through the axis of rotationof the plate It will'also be noted that in each instance.

the article to bc ground makes Contact atl 'lhese rollers` are too.

various points with each of the plates '1 and l' Q, and that the distances of said points from the axis of said plates, -is not.. proportional to the distances of the same points from the longitudinal axis of said article, so that the action between said plates and said article is partlyv a rolling and partly a rubbing action. -Experimentshows that in grinding cylindrical or conical rolls between plates there is a tendency' for the roll to grind awa-y at one part and leave another part of greater diane. eter. For example, the roll 'may grind away at; the ends. leaving the middle of sutliciently greater diameter so that the middle of thego roll has a true rolling action between the plates. the rubbing action being confined to .the ends` and consequently the .grinding being confined to the ends until said ends an: of sensibly smaller diameter than the middle. In order to break up this tendency to the formation of a section of true rolling action and another section or sections of rubbing act ion, tbesm'faces of the plates may be interrupted 'by a series of staggered holes as 9o shown in Figs. 11 and 13 or by grooves having sonie other direction than radial, as in Figs. 12 and vla. In these figures the-construction, with the exception of said hole', or grooves, is substantially the same as in other figures of the drawing, the plates 1 and 2 having fiat surfaces for the grinding of cylindrical rolls 4-2. and said rolls being controlled by spacer plates 43. In Figs. 11 and 13 a series of holes 44 has been bored 100 into the faces of the laps-or plates and in Figs. 12 and 14 a. spiral groove 45 has b een cut in each of said faces. If one part of the cylinder 4Q is of slightlr greater diameter. than another and therefore has` a tendency to a true rolling motion` this particular partl will frequently run over or under one of the holes -t-t or else it will he for pa rt 'of the time over or under one of the grooves 45 and atthose times the pressure ,which causes true rolling action will be transferred to some other part ot the c vlinder and the first mentioned part will receive the rubbing action and will consequently be reduced in diameter. It will he seen that the interruption of the grinding surfaces by the holes -l-t and grooves 4?. tends to break up the formation of a section of larger diameter and tends to cause the roller to be ground more uniformly throughout its length.

ll'hile I have shown this device of interrupted grinding surfaces applied onlvY to the' grinding of cylinders. it 'will he perceived that it is equally adaptable to cones. 5

Various changes can he made in the detail.`- of: construction and arrangeuu-nt without departing from my invention.

ll'hat l claim as new and desire to secure l liv Letters Patent. 1s:-

1. The combination of two co-axial grinding members` having grinding surfaces facing each other, said grinding'snrfaees being annnlarlvdisposed about the common axis of said members and each formed with a cross-section complenwntar)y to the longitu dinal .sections of the articles. to be ground aml'stu-bthat. when said two members are in position facing each o-ther. there is. an.

annular space between themwhich in crossi section ha:=. boundar)v lines correspmnl-ing' to those of the parte,- of said articies that are to be ground, and means for guiding said articles so as to maintain their longitudinal axes in fixed-relation to .said eonnnon'axis of said members, the form of the parts being suitable for grii'iding articles having snrfaces of revolution about longitudinal axes and each of varying radii at ditl'erent poi-nts along its axis.

' 2.' 1n a device for grinding articles having surfacesof revolution about longitiutinal axes and each of varying radii at diti'erent points along its said axis, the combination of two co-axial lates having relative rotary motion, said p ates having grinding surfaces annular-1y dis oscd about the laxis of such motion and W ich in cross section are complcmentary in form to the-longitudinal secticns of the articlesto be round, and a disk between said plates and aving a series of openings to guide said articles, each of saidopenings being formed approxix-nately like thc-1ongitudinal section of one of said articles.

3. In a grinding or lapping device, the combination of two lates having coincident axes and having 4tieir adjacent surfaces formed for indmg pins each having a cylindrical middle portionand two tapered ends, and a separator disk having a series of radial openings adapted to guide said pins, each of said plates having an annular groove' to clear said cylindrical middle portions.

L In a grinding device, the combination of a lower grinding plate haring an annular grinding surface and formed inside Aof said grinding surface with a (lange which constitutes a dam, an axial hole. through .said plate, and an npper grinding plate having a cooperating annular grindingstuface and having a spindle adapted to work in said hole, said dani acting to keep' the abrasive from llowing into the bearing.

5. In a grinding or lapping device. the combination of two grinding members hav ing' coincident. axes and having in their adjacent sides, annular surfaces for grinding elongated articles and haring alsogrooves cut. so as not to touch said articles at points in the length ofthe latter where no grinding is desired, and means for guiding `said articles between .said members.

G. In a grinding or lapl'iing device, the. combination ot' two grinding members having relative rotary motion about a. common axis, said members having surfac for grinding the two ends of pins, and means for guidin said pins so as to maintain one end of eaci pin nearer said axis than the other end.

Signed at Ilion, in the count of Herkimer. and State of New York, t is 3rd day of July, A. Ilo/1912.

WILHELM A, SCHMIDT.A

Witnesses:

Gn H. GRIFFITH,

GUS, FOLEY. 

